H-21 is 9% Tungsten hot work tool steel. H-211.2581 Work tool Steel was developed to extend the life of aluminum die cast moulds. Used for hot-working dies and tooling such as die casting, extrusion and hot forming of parts. This alloy is one of the Hot Work, tungsten containing tool steels. The tungsten content is beneficial for hot strength at red heat, although toughness is somewhat reduced. Applications : Tools for metal tubes & rods, extrusion. Presses, rams, forging dies etc. Sizes Available : Rounds. Dia and Length are as per clients request.